What is the difference between cast iron valves and cast steel valves

Release time:

2024-04-08

The main difference between cast iron and iron steel valves is that the carbon content is different, and the carbon content directly affects the strength and plasticity of steel. Carbon steel is also called carbon steel, iron-carbon alloy with carbon content less than 2% WC. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus. According to the purpose, carbon steel can be divided into three types: carbon structural steel, carbon tool steel and easy-cutting structural steel. Carbon structural steel is divided into building structural steel and machine manufacturing structural steel. According to the carbon content, carbon steel can be divided into low carbon steel (WC≤ 0.25%), medium carbon steel (WC0.25%-0.6%) and high carbon steel (WC 0.6%) According to the content of phosphorus and sulfur, carbon steel can be divided into ordinary carbon steel (high phosphorus and sulfur), carbon steel (low phosphorus and sulfur) and steel (low phosphorus and sulfur). Generally, the higher the carbon content in carbon steel, the higher the hardness, the higher the strength, but the lower the plasticity. cast iron

cast iron

Cast iron is an iron-carbon alloy with a carbon content of more than 2%.

Cast iron can be divided

1, gray cast iron 2, white cast iron 3, malleable cast iron 4, ductile iron 5, vermicular graphite cast iron 6, alloy cast iron

Generally we say that the cast iron valve, the use of ductile iron, gray cast iron after spheroidization treatment to obtain, the precipitation of graphite is spherical, referred to as ductile iron. It has higher strength, better toughness and plasticity than ordinary gray cast iron;

cast steel

Steel for casting. A cast alloy. Cast steel is divided into cast carbon steel, cast low alloy steel and cast special steel 3 categories; cast carbon steel. Cast steel with carbon as the main alloying element and small amounts of other elements. Carbon content of less than 0.2% is cast low carbon steel, carbon content of 0.2 to 0.5% is cast medium carbon steel, carbon content of more than 0.5% is cast high carbon steel. With the increase of carbon content, the strength and hardness of cast carbon steel increase. Cast carbon steel has high strength, plasticity and toughness, and low cost. It is used in heavy machinery to manufacture parts that bear heavy loads, such as rolling mill frames, hydraulic press bases, etc.; it is used in railway vehicles to manufacture large forces. And bear parts such as bolsters, side frames, wheels and couplers;

From the above material characteristics, cast iron is more rigid than cast steel, and its brittleness is larger than cast steel, and cast steel has better plasticity and toughness than cast iron. Therefore, cast iron is generally used in pipelines with relatively low pressure. At the same time, it can only be used in pipelines at normal temperature, because the increase in pressure or temperature indicates that the valve will have certain trace deformation, cast iron valves are disadvantageous relative to cast iron valves. Cast steel valves can be used in pipelines with relatively high pressure or temperature.

Application of Cast Iron Valve

For example, we often see the valve used to transport water pipes, the valve surface is sprayed with black paint, this kind of valve is cast iron valve.

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